One is the fastest man on Earth. The other is the Woman of Steel from Krypton.

Usually separated by a few dozen inter-dimensional planes, Barry Allen and Kara Danvers came together Tuesday to prove they have, at least, one thing in common: some impressive pipes.

The dynamic duo were aces in “Duet,” the long-teased (and let’s be honest, inevitable) musical crossover, which marked their second outing together — the first since “Supergirl” moved to The CW. Putting to good use their effortless chemistry and truly winning comedic timing, Melissa Benoist and Grant Gustin again made the case their super alter egos should bring their respective Earths together more often.

The episode reunites Benoist and Gustin with their fellow “Glee” grad Darren Criss, whose Music Meister traps the heroes in a 1940s-set movie musical, complete with gangsters, glitz and gaudy accents (executed to various degrees of success). The episode, from its sepia color palette to its “West Side Story”rip-off plot, is so cheese-tastic it should have been sponsored by Kraft. And that’s a compliment. Of all the Arrowverse shows, “Supergirl” and “The Flash” are the most kindred spirits — even though the latter has taken a few dark turns as of late.

Leaning hard into the ease with which movie musicals tend to unfold, the Music Meister advises the Super Friends to play along with the script as familiar faces from both of their worlds collide to the sound of a glorious refrain.

Here’s what we thought of the five songs performed in “Duet”:

“Moon River”

Benoist kicks off the musical vibes with this “Breakfast at Tiffany’s” cover that soft on the ears and gives a nice showcase of Supergirl’s talents behind the microphone for those not acquainted with her voice — even if she not bulletproof when it comes to the song’s lower notes. It’s a romantic number that sets the mood of the smoky nightclub where the action will unfold and is only made better by Gustin’s goofy grin as he watches from the crowd. Grade: B

Grant Gustin and Melissa Benoist watch as Darren Criss, Carlos Valdes and John Barrowman break out into “Put a Little Love in Your Heart” on “The Flash.” [THE CW PHOTO]

“Put a Little Love in Your Heart”

The big group number sadly doesn’t feature the vocals of our leads, but it does give a few good gentlemen a chances to show off their vocal talents. Criss largely cedes the song to Carlos Verdes (Cisco), John Barrowman (Malcolm) and Jeremy Jordan (Winn), the latter of whom’s insanely good voice should be no surprise to “Smash” fans. The choreography here (from “Glee’s” Zach Woodlee) is just fun and the use of the entire nightclub for a plethora of dancers to fall in line is about as movie musical as this movie-musical-within-a-TV-show gets. Grade: B+

“More I Cannot Wish You”

If any song feels like a stranger in the bunch, it’s this profession of patriarchal love for the dream musical’s lovebirds (Candice Patton and Chris Wood), sung by their warring gangster fathers Barrowman, Victor Garber and Jesse L. Martin (an original “Rent” cast member, no less). There is no questioning the trio of musical veterans’ talents and they are absolutely deserving of the spotlight. But this “Guys and Dolls” cover just feels out of touch with the rest of the musical’s selections. Though here again, adding some much needed levity is Gustin’s reaction shots, particularly when he stands up to clap at the end and quickly realizes he’s not watching this on TV. Grade: C+ (I still adore you Garber, Martin and Barrowman)

“Super Friend”

This cheeky diddy — co-written by “Crazy Ex-Girlfriend’s” Rachel Bloom — is just pure joy incarnate. From Gustin’s lighter-than-air tap dancing to Benoist’s “gosh, Barry” responses, watch this with anything less than a big smile on your face and you might want to check for a pulse. The sing-speak banter throughout — Barry stopping the song to poke fun at his own habit of poorly executed time travel or throwing some super shade at Kara’s more-famous cousin — also acts as yet another showcase for the pair’s charming chemistry. Plus, if you’re going through “Crazy Ex-Girlfriend” withdrawals like I am, this has Bloom’s fingerprints all over it. Grade: A-

“Runnin’ Home to You”

Gustin brings down the proverbial house with this beautifully written and sung ballad from recent Oscar winners Benj Pasek and Justin Paul (“La La Land”). The title speaks for itself, with Barry cuing up the song after returning to reality to propose to Iris. Gustin wraps up what is really a triple-threat showcase for him (the guy can sing, dance and act — all at once!) with a really tender performance completely in his wheelhouse. For fans of “The Flash,” it’s a genuinely special way to pay off the Barry-Iris engagement build-up and just a sweet moment on which to end this otherwise wonderfully tongue-in-cheek musical on. Grade: A

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